Planck's Constant Determination Box Material_Hardwood Manually-operated seismograph model that traces

Manually-operated seismograph model that traces shock waves onto a pulled paper strip

Six-piece 3-inch optical lens set combining three double-convex and three double-concave glass lenses at 200mm

Plastic-bodied wave apparatus with eccentric discs that drive metal rods up and down as the handle turns

3g nickel-plated steel balls on a red wood base

5-inch female pelvis model demonstrates 9-month pregnancy anatomy and fetal positioning before delivery for obstetrics teaching

Planck's Constant Determination Box Material_Hardwood Manually-operated seismograph model that tracesDesigned to measure Planck's constant through the photoelectric effect, relating photon frequency to the kinetic energy of emitted electrons for quantum physics investigations.